"The signs provide clarity for what routes are open when heavy rain and flooding happens."
He said the signs had been two years coming and would prove beneficial, especially during one of Martinborough's many festivals and events.
"They will be helpful for any tourists coming over the hill and if one road's closed it will supply the other options.
"It's good for civil defence and if we have an earthquake it allows people to know where to go."
Mr Allingham said the signs were fully automated and were controlled 24/7.
"We're also talking to the New Zealand Transport Agency about putting new directional signage on the routes," said Mr Allingham.